4wd Light On Dash

[Ska]

Howdy Gals & Guys.

I have a very interesting issue, my 4WD light comes on intermittantly.

I have a 97 Stagea RS Four V which has been converted to Manual and has a Power-FC put into it, amoungst other bits and pieces.

Anyway All the work was done before I bought the vehicle. Bought it about a year ago.

Now it has been bloody awesome, except as the weather has gone colder and colder I notice that if I give it a squirt when the weather is cold, the 4WD light does go on and I do go into RWD mode, which is worries me a bit.

I have checked the fluid level in the ATTESSA system (in the rear) and checked all the fuses, all look fine......?

No here is the funny thing, if I leave the car in sunlight for 2-3 hours and make sure that the passenger rear section is in the direct sunlight, (where the ATTESSA ECU is), I dont have this issue... wierd eh.

So what i am thinking is that the ATTESSA ECU doesnt like being cold..... WTF?!?!?! That cant be right!

So did a search but cant really find any threads that help out so anyone have any ideas what it could be?

Thanks!

Cy

[NISZILA]

When any circuit board gets a bit older, the tracks can form very small cracks. These tracks stop the flow through the cracked track. When the circuit is heated the tracks expand, in turn closing the cracks and therefore making the circuit work again. I dought that this is your problem as it generally only happens to much older circuits, but if your can has been heated and cooled a lot, this constant expantion and contraction of the tracks could form these cracks, say if it stands in the sun a lot in the day and then gets really cold at night.

Maybe just another avenue to look down, good luck.

P.S you will need a magnifying glass to see these cracks

[Ska]

Cool sounds plausable, just didnt think it was that probable! The car does sit out in the sun in the summer time and it does get cold at night, as it is only in a carport, not garaged, but still only gets done to ~10oC overnight, so might be it.

I dont intend on ripping out nearly the entire rear section f my car just to get to the ATTESSA system if I dont have to. I wouldnt even know what to look for anyway